/**
 * Copyright (C) 2013 DaiKit.com - daikit4gxt module (admin@daikit.com)
 *
 *         Project home : http://code.daikit.com/daikit4gxt
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.daikit.daikit4gxt.client.ui.fields.validator;

import java.util.ArrayList;
import java.util.List;

import com.daikit.daikit4gxt.client.DkMain;
import com.google.gwt.editor.client.Editor;
import com.google.gwt.editor.client.EditorError;

/**
 * Validate an {@link Editor} to ensure value is a Number.
 * 
 * @author tcaselli
 * @version $Revision$ Last modifier: $Author$ Last commit: $Date$
 */
public class MyNumberValidator extends MyRegexValidator
{

	final boolean canBeNull;

	/**
	 * Validate an {@link Editor} to ensure value is a Number.
	 * 
	 * @param canBeNull
	 *            a boolean indicating whether the field can have a null value.
	 */
	public MyNumberValidator(final boolean canBeNull)
	{
		super("^[0-9]*\\.[0-9]*", DkMain.i18n().error_validation_should_be_number());
		this.canBeNull = canBeNull;
	}

	@Override
	public List<EditorError> validate(final Editor<String> field, final String value)
	{
		final List<EditorError> errors = new ArrayList<EditorError>();
		if (!canBeNull && (value == null || "".equals(value)))
		{
			errors.addAll(createError(field, DkMain.i18n().error_validation_not_null_or_empty(), value));
		}
		errors.addAll(super.validate(field, value));
		return errors;
	}

}
